Custom Exceptions

[Chris Dunaway]

I'm creating a Web service and a Windows Forms application to consume it.
My question is about throwing a custom exception inside the WebService.
Can that be done, and can the custom web service be handled in the Windows
Forms app?

For example, suppose in my WebService, I have the following exception
class:

'\\\\\
<Serializable()> _
Public Class WebServiceException
Inherits ApplicationException <<<<<<< Is this correct?

'Code for exception class here

End Class
../////

And then within my web method:

'\\\\\
<WebMethod()> _
Public Sub SomeWebMethod()

If SomeCondition Then
Throw New WebServiceException
End If
End Sub
'/////


On the Windows Forms client, I can only trap for generic exceptions not my
custom exception type:

Try
WebService.SomeWebMethod
Catch ex As WebServiceException <<<<<<<<< This doesn't work
'Handle it
End Try


Anyone know of a way to achieve this?

Thanks for any pointers

 

[Jan Tielens]

Check out following article that covers this topic:
http://www.microsoft.com/belux/nl/msdn/community/columns/jtielens/soapexcept
ions.mspx

Throwing SoapExceptions

Summary:

Sometimes things can go wrong when code is executed, so Exceptions are
thrown. When your application exposes services through a webservice layer,
SoapExceptions are thrown from the server to the client. By default normal
Exceptions are converted to a SoapException, resulting in a rather ugly
Exception containing all information concatenated in a long String. But
luckily the SOAP protocol allows any XML document to be included in SOAP
error messages. This article shows how to build some helper classes to
easily pass error information from the server to the client through a
webservice layer.

--
Greetz

Jan Tielens
________________________________
Read my weblog: http://weblogs.asp.net/jan